Industrial furnace



March 9 1926. 1,576,033

H. H. BUBAR INDUSTRIAL FURNACE Filed August 10. 192s s sheets-sheet 2March 9 1926.

H. H. BUBAR INDUSTRIAL FURNACEv Fi1ed`August 10, 1923 3 Sheets-Sheet :5

Vertical sectional view on Patented Mar. 9, 1926.

UNITED stare PATENTI oFFlcE;

` HUDSON H. BUBAR, or NEW Yemen. Y.

INDUSTRIAL `'FUnNi/ioii..

Application filed August 1o, 1.923. serial No. 656,656.

tion having complete mechanical control of the roasting land oxidation(when required) from the time the material enters until it isdischarged. In carrying out this invention I preferably employthecombination of a reverberatory furnace and a preheater ar- 'ranged todischarge the material on to a horizontal hearth. `Within the furnace llf provide a rabbler which is adapted to travel back and forth withinthe furnace and thor oughly mix up and turn over the material beingtreated. Details of construction and mode of operation will beunderstood from" the 'following description and the Aaccompanying` threesheets of drawings.

Fig. 1"is al horizontal section'andplan showing parts of the apparatusmore or less diagrammatical. j

Fig. 2 is a corresponding longitudinal the plane. of the line 2 2NofFig. 1.

Fig. 3 is a transverse sectional View on the plane ofthe line 3 3 ofFig. 2 on a somewhat larger scale. 1 v

Fig. 4 is a side view of one form of rabbler.' j f j Fig. 5 is afragmentary plan view of part ofthe rabbler looking in the direction ofthe line 5 5 of Fig. 6.

Fig. 6 is a fragmentary edge View of the parts'of the rabbler looking inthe direction of the line 6-7-6 of Fig. 4f. f

Figs. 7,` 8 and 9 are detail views'of a modified form offrabbler.

Fig. 10 is a side view showing cooling bars. p 4 Y Fig. 11 shows detailsof the mechanism for adjusting and moving the cooling bars on the line11-11 of Figure 12.

Y Fig. 12 is a detail View of parts of the mechanism shown in Fig. 11and taken on the line 12-12 thereof.

The substance to be roasted is fed into the preheater through the hopperand chute at fveyor 8 where it is finally discharged 1 in F ig. 2, isgradually carried through the preheater to point of discharge at'2whereit is dropped through flue 3 to heartht being graduallycarriedforward by rabbler 5 to point of discharge 6 where it falls on inclinedcooling plates 7 and Vthence to confrom the furnace. y

Air', is drawn in through conduitsrQ, and

`passes, between j the cooling bars and the material thereon and` alsothrough the-*fire box 10 andfover'the. wall 11r and Aback through lthechamberV 12. rThe gases pass outY flue 3 around the preheaterY andoutrthe chimney` or stack 13. The circulation in the hearth not onlykeeps the;hearth cool but pre-heats the air going to the furnace. Thehearth 4 may also have `cooling passages, 9. Itvr should be understoodkthat although the furnace is shown as arranged for coal, gas

or'oil may be provided for `if desiredwithin Athe spirit of myinvention.

The preheaterfor the ore or'other material consistsofa rotating steelcylinder 14 in a chamber 15 formedin a fire brick shell. Baflies'16 and17 may be provided to provide a tortuous passage for'the waste gases soas to vpreheat the material to as high a temperature as 'possible or tothe temperature required. ySupplementary flue 18 or. by-pass maybeprovided if desired with ajdamper 19 or control element. The spring ofthe archy 2O is preferably designed so as to reflectl directly on thehearth. l t

The rabbler has two side frames 22. pro'- vided with wheels 23 andj2twhich travel von tracks 25 and 26 beneath the side edges of the hearth.Track 26 and wheel 2,4 at one sidel maybe so designed as to` permit sideways expansion and contraction of the rabbler. Upper guides 27 and 28may be provided for preventing the rabbler fromA rising. p

The sides 22 of the carriage, the shaft`29 and blades 30 and 31 of therabbler are all hollow to permitcirculationof air for coolingthevrabbler parts and insome cases for oxidizing the material to betreated. The blades may have outlets 32 for admitting air directly tothe ore or other material.

Air is supplied to the rabbler through flexible hose y33 adapted to bewound on air drum 34. An equalizing spring and ratchet 35 maybe employedto keep. a uniform tension on the drum and hose. "The drum is drivenwith the shaft 36 Which is connected to the rabbler drive sothatthe-rab- `bler and hosewill move synchronously.

The rabbler carriageis moved back and forth by the chains 37atanyfdesired 'speed' and it may be reciprocated for a part of thelength of the-hearth at any placeron? the hearth or the. entire length.The preferred form of rabbler is rotatedby chainBS from shaft 39 andgears40 driven in any suitable Way for instance` stationary rack orchain 40'.'

material thoroughly. The normal position of rest for therabbler is inthe chamber 4l beyond theflue When the `rabbler starts toward the firebox `it `rotates idlygover` thehearth, the shaft 39 beingy provided Witha one-Way automatic clutch 39. When it starts back` on the re# turn4trip the shaft 29 and blades start rotat-` ing clockwise asvievved inFig.'2,thereby mixing and'oxidizing the material While.

forcingiit a certain d istancealong toward the discharge-incline 7. Y

The rabbler shown inFigs. 7, fandQ'ha-s tWo sleeves or shafts 42, 42fWith vlingers 43,V

43. These shafts`42 and 42" are connected by a link 44 'so that`they-may be. rocked by a rod 45 and crank 46. The lingers 43 and 43 maybe lifted .at any time byv means f of the rod45. These rabblerfingersact like the teeth of a rake When the rabbler moves toward theiirebox and carry along some of the material toward the inclined dis-Hcharge 7 When the material falls upon the cooling y plates it ispartially cooled and oxidized by the admissionY of air and discharged onthe. conveyoriS` or onto another hearth like 4 Where it maybe againtreated.`

The inclined plates 47 are `supported.nearl the middle of their ends byrollers 4 8`andA are also provided Vv vith extensions 49 which arehinged tobars 50. Bars 50 aresup- `orted by rollers. 51 carried by fbars; 52.

' increase or decrease the opening 57 Vbetween adjacent plates and thusadmit moreoi`- less air as desired to the hot material; i

.In cases Where the introduction ofair di"- rect` to `the oreior othersubstance isf disadvantageous the rabbler Would have no dischargeoutlets but the cooling air could be The blades onthe rabblerarestaggered or offsetso as to sweepevery part" kofthe hearth and turnover and lnixthe.l

admitted into the rabbler through one side and out the"otherxo`r outthrouglrsomepart of i the rabbler Wherethe air Will not 1come in directcontact with the material being treated.

Itshouldal'soloe-understood that air may be admitted through the rabblerto the ore aircan be admitted, during part of the rabbhng stroke`and"cu`t"oif during the remainder.l Although I have referred to the invention .as particularly adapted to roasting ores, itf should beunderstood-that the 4ape@y paratus is` alsousefui for drying'or other-QkWise treatingfrvarious other materials. Y

. VVhatI claim iszl. A." roasting furnace comprising, ex.- tendedstationary hearth for treating mate# rial with the products ofcombustion, a.

rabbler movable longitudinally ofA` said hearth, a pre-heater fordischargingfmatei rial upon one end. of said hearth, and.4

means for passingthe gases from the mate,-` rial around the Voutsideofthe pre-'heater Without contact' With the materiall inthe pre-heater.i f,"

2. `A roasting furnaceqcomprsing al lon,-

gitudinally extending hearth having air` cooling passages, supportingtracks mount-fV edV beneath the opposite edges offl said hearth,v `sideframes extendingjabove and belovvfthe opposite sidesof said hearths,`

each side frame having Wheelssupportedon said tracks, a rotating'rabblercarried.` by `said side frames above said hearth, and', means for movingsaid'frames alongsaid tracks androtating said Vrabble-r above saidLhearth. 3L Ina furnace, alongitudinallyA extend? .ingliearth, a rabblerrotatably'mountedfft travel back and lforth over said ,-hearth,v saidVrabbler having air passages, a drumyiiexiblehoservound on said drum andconnectedht said rabbler, and means for niovi1ig'`,`said. rabblerback'and forth. y y f 4. A furnace comprising an? extended hearth, arabbler mechanism movable along said hearth and having4 a frame with`ali-lair" passage, anda` rotating rabblerg'member having blades With'air Voutlets" in theends f 115 5. `In a furnacegfa rotating pre-heaterVY of said blades. i l

having means for admitting orefat'o'ne end,JE and means, fordischargingfore from-,the other end, a roastinghearthhaving `onefendarranged4 beneath the discharge end" offsafidt pre-hea`ter,y meansforpassinggases from` the` material being roasted around the out# Y side ofthe pre-heater and: automaticmeans for Vmoving the ore alongsaidlhearthl Y 6. In a furnace`,a pre-heater having-a' passage throughwhich ore is di'schar ed into the furnace, and through" which?. Tot

gases pass out around the pre-heater,4 anda supplemental controlled"passage leading from the furnace to saidpre-heater:

7. In a furnace, a series of inclined discharge plates for the roastedore, and means for moving said plates back and forth and up and down. l8. In a furnace, a series of inclined ore discharging plates, means foradjusting them vertically and means for reciprocating said plates.

9. In a furnace, an inclined cooling grate having discharge plates forroasted ore With controllable openings therebetween.

10. In a furnace, a hearth, a rotating rabbler having blades movablealong said hearth, and means for admitting air through said blades fordirectly controlling the oXidization of the substances being roasted.

1l. In a furnace, a hearth, a rabbler hav-4 ing rotatable blades movablealong said hearth, and means for admitting air through said blades forcontrolling 'the oxidization of the substances being roasted.

12. In a furnace, a presheaterhaving a passage through which ore isdischarged into the furnace and through which hot gases pass out aroundthe pre-heater, and a supplemental passage leading from the furnace tosaid .pre-heater and means for rab-v bling the ore in the furnace.

13. In a furnace, a pre-heater having a rotating drum and divisionalpartitions and baliies for causing heated gases to pass around said drumand means for controlling the How of gases. I

14. In a furnace, a series of inclined discharge plates for the roastedore, and means for separating said plates.

15. In a furnace, an inclined cooling grate having plates for roastedore and having controllable openings therebetween and a transversedischarge conveyer at the llower end.

16. In a furnace, an extended hearth, a rotatable rabbler movable abovesaid hearth and having air outlets, a power driven drum and air hoseWound on said drum and kconnecting said drum and said rabbler.

17. In a roasting furnace, amovable air cooled rabbler, an air drum, aflexible air` hose onrsaid drum connecting the drum and rabbler andspring actuated means fo maintaining tension on the hose.

HUDSON H. Busan.

